Unit abrading element



Jan. 25, 39%, K. w. CONNOR UNIT ABRADING ELEMENT Filed April 19, 1934 v Patented Jan. :25, 193-8 UNITED STATES PA'lEN mmlmmnmc mam Kirke W. Connor, Detroit, Mich ll ill or to M1- cromatio Hone Corporation, a corporation of Michigan v Application April 19, 1934 Serial No. 721,204

- 2 Claims.

My invention relates to honing tools and par,- ticularly to unit abrading elements therefor which constitute the radially movable portion of the tool.

- It has been the practice heretofore in the art to provide a honing tool with a baseportion which is adjustable radially relative to the tool and to provide an abrading element which is separately bonded to or removablysupported on the base portion to'be radially moved therewith.

' The present invention embodies the construction of a combined base and abrading element to form the radially movable portion of the tool. An abrading stone, made up of bondedparticles to constitute a unit element, has a base molded directly thereto out of a material which forms a bond with the abrading stone. The molding material is formed in the shape of a base which may be extended or otherwise molded to constitute retaining or holding portions for the unit. Inserts may be disposed within the molding material to constitute the means by which the unit abrading element is retained on the tool. Any molding material which will form a bond with the unit abrading stick may be employed, such as metal or materials employing phenol condensation products, rubber, cellulose or the like, as a base.

Accordingly, the main objects of my invention are to mold a material on a unit abrading stick to form a unit radially movable element of a honing tool; to provide an abrading stick with the bonding material molded to form a base which reinforces the stick and forms a portion of the abrading tool; to have the end portions of the molding material extended to constitute engaging means for retaining the unit abrading element on the tool; to provide inserts in the molding mate-'- rial-which project therebeyond to be engaged by retaining means for holding the unit abrading elements on the tool; and, in general, to provide a unit abradlng stick which is renewable, rigid and economical of manufacture.

Other objects and features of novelty of my invention will be either specifically pointed out or will become apparent when referring, for a better understanding of my invention, to the following description taken in conjunction with the accompanying drawing, wherein:

Fig. 1 is a broken plan view, partly in section,

of a honing tool embodying features of my invention,

Fig. 2 is an enlarged broken sectional view of the structure illustrated in Fig. 1, taken on the line 2-2 thereof.

Fig. 3 is an enlarged sectional view of the structure illustrated in Fig. 1, taken on the line 3-3 thereof,

Fig. 4 is a broken view in elevation ofa honing tool, similar to that illustrated in Fig. 1, showing a modified form thereof;

Fig. 5 is an enlarged perspective of an abrading element embodying features of my invention,

showing a further modified form thereof, and

Figs. 6, 7, 8, and 9 are perspective views of abradlng elements, similar to that illustrated in Fig. 5, showing further modified forms thereof.

In practicing my invention, I construct unit abrading elements in containing abrading sticks ll constructed of bonded abrading substance to form a unit element.

Each stick H has a base I! bonded thereto molded from a material which readily bonds with the stick and formed into a predetermined shape. Inserts I3 are molded in the ends of the base ii to provide hooked ends which are engaged by garter springs M for retaining the unit elements It) on the honing tool for radial movement relative thereto.

The molding material for the base i2 is preferably in powdered .or macerated form when a molten metal is not utilized. Such substance as a phenol condensation product, and its derivatives, can be employed successfully which are heat hardened and made up primarily of formaldehyde and phenol as a base. When sucha molding rosin of the heat hardening phenolic type is utilized, an inert filling material such as sawdust, asbestos,clay, impregnated paper, woven fibers, macerated paper and/or' fibers are employed. Such material is treated with the phenol material and pressed to predetermined form, about the abrading stick, in heated molds.

The material may be further heated after removing from the molds to complete the chemical reaction in the rosin. Any condensation product of phenol, formaldehyde or other substances known in the art to be suitable for molding into a ll to thereby eliminate the inserts heretofore referred to.

In P18. 7, I have shown a unit abrading element having the end extended at 2.! to form a ledge for receiving the end of an individual spring, such as that disclosed in the patent issued to F. M. Kern, No. 1,944,662, dated January 23, 1934, and assigned to the assignee of the present invention. In the present construction, the stick ll is of the same width as the base l2. The material extends over the end to provide additional strength to the bond. A dovetailed end or undercut portion could be provided to eifect additional strength.

In Fig. 8, I have shown a further modified form of my invention which follows the construction of Fig. 5 with the exception that a tube 22 is provided over each of the hooked ends of the wire I! for the purpose of enlarging the surface thereof to prevent the spreading of the garter springs l4 over the wire.

In Fig. 9, I have shown a further modified form of the structure illustrated in Fig. 5, wherein the wire i1 is flattened at the hooked ends 23 to provide a broader surface for the reception of the garter springs it. In this construction the stick I i is bonded during the molding operation directly to the back surface of the base l2.

In all of the constructions, unit abrading elements are provided constituting renewable parts of'the honing tool. The material which forms the backing element 12 is molded directly to the abrading stick Ii forming a direct bond therewith. After the abrading stick II is worn beyond useful life the entire element ll maybe discarded and a new element substituted therefor. A

further advantage in this type of construction re- 7 sides in the elimination of hard metal parts adjacent to the abrading element which, when the abrading stick It became worn, caused the marring of the surface of the cylinder wall being honed. The molded material may contact the cylinder wall without causing damage to the surface as would occur when hard metals were employed for supporting the abrading stones.

It will be understood that any type of molding material may be utilized, the phenol and rosin compositions hereinabove referred to being cited as an example. It is to be understood that any material known in the art to be suitable may be utilized for bonding tothe abrading stick and forming the backing element therefor to constitute radially movable, abrading and base elements of the honing tool. Any rosin, synthetic or otherwise, rubber, cellulose or the like, may be employed alone or in combination with each other or other material or materials, while relative soft metals such as lead, tin, sine and the like, alone or in combination or in combination with other elements could be utilized. Such metals could .be salvaged and reemployed after the abrading sticks have been worn beyond useful life.

While I have described and illustrated several embodiments of my invention, it will be apparent to those skilled in the art that various changes, omissions,' additions and substitutions may be made therein without departing from the spirit or scope of my invention, as set forth in the accompanying claims.

I claim as my invention:

1. In a honing tool having a head for carrying an abrading element and means on said head for engaging said abrading element to adjust the same, an abrading element comprising an abrasive stick, a holder for said stick of heat hardenable resin non-i iurious to the surface upon which the tool is operating, said'holder having one face formed to cooperate with said tool adjusting means and having an end thereof extended beyond the abrasive element for retaining the holder on said tool, said holder being so formed and bonded to the abrasive element during the mold-- ing operation.

2. An abrading element for a honing tool ha ing an adjusting means comprising in combination, an abrasive stick and a molded holder for said stick of heat hardenable resin bonded to said stick during the molding operation, said holder having a cam surface to cooperate with tool adjusting means and having an end extended beyond the abrasive element to retain the holder on the tool.

- KIRKIW. CONNOR. 

